<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"
    isErrorPage="true" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

<%=request.getParameter("username")%>

<%
	out.print(pageContext.getAttribute("a"));
	out.print(request.getAttribute("b"));
	out.print(session.getAttribute("c"));
	out.print(application.getAttribute("d"));
%>
</body>
</html>